How We Calculate

This page explains, tool by tool, what BibleCalcs actually does with the numbers, dates and text you give it. Everything runs in your browser: what you type into a calculator is not sent to our servers. If a result ever looks wrong, please tell us.

Tithe Calculator

You enter an income amount, how often you receive it (weekly, biweekly, twice a month, monthly, or an annual total) and a percentage, which starts at 10. The tool multiplies the amount by the percentage to get the amount per pay period, then multiplies that by the number of pay periods in a year (52, 26, 24, 12 or 1) to get the yearly figure. The per-month and per-week averages are the yearly figure divided by 12 and by 52. Results are shown in US dollars to two decimals. The tool does not look at taxes, deductions or whether you start from gross or net income; that choice is yours. Missing or non-numeric entries count as zero.

Bible Reading Plan Calculator

You pick the whole Bible (1,189 chapters), the Old Testament (929) or the New Testament (260), and a start date. In pace mode you give chapters per day, and the finish date is the start date plus one fewer day than the number of days needed, where days needed is the chapter total divided by your pace, rounded up. In target-date mode you give a finish date, and the daily pace is the chapter total divided by the number of days from the start date to the finish date, counting both end days. Dates are handled in UTC so that time zones and daylight-saving changes cannot shift a result by a day. A finish date on or before the start date is rejected with a message.

Daniel Fast Calculator

Pick a start date and a length (3, 10, 21 or 40 days, or a custom number). The last day is the start date plus the length minus one day, so a 21-day fast starting on the 1st ends on the 21st. The status line compares the start and end with today’s date and reports days until it starts, that it starts today, days left, or that it has ended. The tool counts days only. It does not say what you should eat or avoid, because churches and guides differ.

Holiday Countdown Calculator

Christmas is fixed at December 25 and US Thanksgiving is the fourth Thursday of November. Easter (Western, Gregorian) is computed with the standard Meeus/Jones/Butcher algorithm for the year you choose. Ash Wednesday is 46 days before Easter, Palm Sunday 7 days before, Good Friday 2 days before, and Pentecost 49 days after. The countdown is the number of days from today to that date. Eastern Orthodox Easter follows the Julian calendar and is not calculated here. The year field accepts 1900 to 2199.

Hebrew Date Converter

The converter uses the traditional fixed arithmetic Hebrew calendar: the molad of Tishrei, the four postponement rules (dechiyot) for Rosh Hashanah, the 19-year cycle with seven leap years, and the variable lengths of Cheshvan and Kislev. Your Gregorian date is first turned into a day number (Julian Day) and then into a Hebrew year, month and day. The holiday list for the year (Rosh Hashanah, Yom Kippur, Sukkot, Hanukkah, Purim, Passover and Shavuot) is found the same way in reverse. The calendar code was checked against more than two thousand independently generated reference conversions before release. The date range is 1900 to 2199. Dates are shown for the civil day and do not account for the Hebrew day beginning at sunset.

Gematria Calculator

Type a Hebrew or Greek word. For Hebrew, each letter is given its standard value (aleph 1 through yod 10, then tens to 90, then 100 to 400), and the final forms of kaf, mem, nun, pe and tsadi carry the same value as the ordinary forms. For Greek (isopsephy), alpha is 1, beta 2, gamma 3, delta 4, epsilon 5, zeta 7, eta 8 and theta 9; iota is 10, kappa 20, lambda 30, mu 40, nu 50, xi 60, omicron 70 and pi 80; rho is 100, tau 300, upsilon 400, phi 500, chi 600, psi 700 and omega 800; and both forms of sigma are 200. The archaic Greek letters (digamma, koppa, sampi) are not included. Capital letters are treated like lowercase ones, accent marks and Hebrew vowel points are ignored, and any character that is not a Hebrew or Greek letter is skipped. The word is treated as Hebrew or Greek according to its first valid letter. The total is the sum of the letter values, and each letter’s value is listed so you can check it. This is a counting tool only; it makes no claim that numbers carry hidden meaning.

Biblical Unit Converter

This tool is a table lookup, not a formula. For each unit (handbreadth, span, cubit, reed, stadion, Sabbath day’s journey, gerah, shekel, mina, talent, log, hin, omer, seah, bath, ephah, homer, and the New Testament coins) the page holds one approximate US figure and one metric figure drawn from commonly cited study-Bible values. Your amount is multiplied by that figure and shown to two decimal places. Because ancient standards varied by place and period, a cubit of 1.5 feet (0.457 m), for example, is a convention, and other sources use different values. Money and time are shown in relative terms: coins in days of a laborer’s wages (a denarius is one day) and watches of the night in modern hours.

Date comparison pages (crucifixion, Exodus, Daniel’s 70 weeks)

These pages do not compute a date from your input. Each one holds a written summary of every major position (for example AD 30 and AD 33 for the crucifixion, or the early and late dates of the Exodus), covering the starting evidence, the method and the main objections, and the drop-down selects which summary to show. The 70 weeks page shows each tradition’s starting decree, its method and its endpoint. No position is presented as proven.

Strong’s Concordance

Each entry page is built from the openscriptures digitization of the 1890 Strong’s dictionary: the original word, transliteration, definition, derivation and the KJV translation words. Hebrew entries (H) also show the simplified pronunciation from the same data. The short English label in each title is derived from the first clean KJV rendering in the data, shortened to at most three words, and it is meant only as a quick handle. Search runs in your browser over an index of all 14,197 entries and matches the number, the original word, the transliteration, the English label and the opening words of the definition. The “Hear it” button uses your browser’s built-in speech voice to read the pronunciation. It is a computer approximation, not a recording of ancient speech. Strong’s entries do not themselves list every verse where a word occurs; to see a word in a passage, open the original-text reader, where each word links to its entry.

Original-text reader

The 1,189 chapter pages show the Hebrew or Greek text word by word with a short English gloss under each word, taken from STEPBible-Data. Each word links to its Strong’s entry. Words that the original implies but does not write are faded. Verse numbers follow the source data, so some chapters show a verse 0 (for example, the title line of Psalm 27), and numbering can differ from English Bibles. The English glosses are word-level help, not a translation, which is why they can read awkwardly.

Translation comparison tool

You pick a book, chapter and verse range (or type a reference like “John 3:16-18”), and the tool shows the same verses in the KJV, ASV, YLT and WEB side by side, up to 50 verses at a time. The text comes from public-domain data files loaded one book at a time. In the KJV, ASV and YLT data the verse numbering is identical, so verses line up directly. A small number of verses (19) are absent from the ASV and WEB because those translations follow earlier manuscripts that lack them (for example Matthew 17:21); for those the tool shows “Not in this translation’s text” with an explanatory note. The translation chart on that page is a static table with its sources linked.

Verse pages and Verse of the Day

The topic pages show a hand-picked set of verses for each situation, followed by written commentary. The translation toggle swaps the text between KJV, NIV, NLT, NKJV and ESV for the same verse reference. The Verse of the Day counts the days since January 1, 1970 (UTC) and picks the verse at that position, modulo the list length, from a curated list. Everyone sees the same verse on the same date, and a date in the address bar shows that day’s verse.

Finders and quizzes

The Bible Verse Finder and the Fasting Plan Finder are menus: you pick the option that best describes your situation and are sent to the matching verse page or to the Daniel Fast Calculator with a length filled in. The Giving and Tithing Approach Finder sends you to the Tithe Calculator with a starting percentage (for example 10 for a tenth, or a lower figure if you are just starting to give), and says plainly that there is no single correct rate. The Bible Translation Finder is a written comparison of the translations to help you choose. The trivia, character, holiday, Strong’s and Torah portion quizzes each use a fixed set of 15 questions with one correct answer; your score is the number correct out of 15. The Denomination Quiz asks 12 questions, and each answer adds points to one or more of nine traditions; the tradition with the most points is shown as the closest match. The Spiritual Gifts Finder asks 30 statements on a four-step scale from “Not at all like me” (0) to “Very much like me” (3), two statements per gift for 15 gifts; each gift scores out of 6 and the top three are shown with a chart of all 15. An optional add-on of 10 statements covers five more gifts that Christians disagree about. These are prompts for reflection, not verdicts about you or any church.

Limits

• Results are as accurate as the sources and conventions above. Ancient measures, coin values and some chronology are estimates or matters of scholarly debate.
• Strong’s numbers and the English glosses are lexical aids; word meaning depends on context.
• Dates use the civil calendar day and do not model sunset, time zones, or regional church calendars.
• Quizzes and finders are short and cannot capture the full range of belief or experience.
• Calculations run in your browser, so very old browsers may behave differently.

Questions or corrections: contact us. Read the full disclaimer.